Which of the following is called adaptor molecule

Options

A. DNA
B. m-RNA
C. t-RNA
D. RNA

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Adaptor Molecule":**
- An adaptor molecule is defined as a molecule that acts as a bridge between two other molecules. In the context of genetics, it often refers to a molecule that helps in the translation process by linking amino acids to the corresponding codons on mRNA.

2. **Analyzing the Options:**
- **Option 1: DNA** - DNA is the genetic material that carries the instructions for the development and functioning of living organisms. It does not act as an adaptor.
- **Option 2: Messenger RNA (mRNA)** - mRNA is involved in the process of transcription and carries the genetic information from DNA to the ribosome for protein synthesis, but it does not function as an adaptor.
- **Option 3: Transfer RNA (tRNA)** - tRNA is specifically designed to bring amino acids to the ribosome during protein synthesis. It has a structure that allows it to attach to both an amino acid and the corresponding codon on mRNA, effectively acting as a bridge between the two.
- **Option 4: RNA** - This is a broad term that encompasses various types of RNA, including mRNA, tRNA, and rRNA. It does not specify an adaptor function.

3. **Identifying the Correct Answer:**
- Based on the analysis, the molecule that acts as an adaptor between amino acids and mRNA is **Transfer RNA (tRNA)**. Therefore, the correct answer is **Option 3: Transfer RNA (tRNA)**.

**Final Answer: Transfer RNA (tRNA) is called the adaptor molecule.**

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